<template>
  <div>
    这个是model --- 父组件 --- {{ num }}
    <hr>
    <Son v-model="num" />
  </div>
</template>

<script>
import Son from './Son.vue'
export default ({
  components: {
    Son
  },
  data() {
    return {
      num: 100
    }
  }
})
</script>
